The patch to remove the EN/EM DASHES from the replacement table is here
https://gerrit.libreoffice.org/c/core/+/117585
It affects --, ---, :--:, and :---:. As well as - for NL. The option replace
dashed still works depending on language and kind of content with EN/EM.
On 29.06.21 11:16, Heiko
We have two options to replace -- by EN (or EM) DASH, one in Tools >
Autocorrect: Replace (-- = -), the other at Options ("[ ] Replace dashes"). This
clearly leads to confusion.
Auto-correction/Replace is defined in extras/autocorr/lang//Documentlist.xml
and turns two dashes into one EN DASH U